Maybe I should go back and get my heart checked. Last year I found out I had a silent heart attack at one point(had to do some physical for insurance first time I've went to the doctor in about 8+ years). I was 27 at the time. I do remember one time in college having sharp pain in my left arm and all the signs of a heart attack, at the time I was doing some PT for a class and the instructor thought I was playing around trying to get out of it.

Good luck on your recovery.